Thick walled hyphae of polypores react in cresyi blue with a wide variety of colours, not only according to the species involved, but also according to the provenance of the dye used. In most cases, the resulting colours are constant for a particular species although there are slight individual variations. In some of the genera investigated all or nearly all species reacted similarly, whilst in
... [Show full abstract] others rather wide differences in the manner of reaction occurred. These differences, taken with other characters, may indicate that taxonomical relationships inside a particular genus (e.g. Amyloporia, Piptoporus) are not as close as at present considered.
